Next to / Beside
Next to and Beside mean the same thing. It usually refers to a thing (or person) that is at the side of another thing.
• At a wedding, the bride stands next to the groom.
• Guards stand next to the entrance of the bank.
• He walked beside me as we went down the street.
• In this part of town there isn't a footpath beside the road so you have to be careful.
Near / Close to
Near and Close to mean the same thing. It is similar to next to / beside but there is more of a distance between the two things.
• The receptionist is near the front door.